with fewer carriers to choose from as industry continues to struggle with high fuel prices and weak economy. us air lines collected more than 1.7 billion dollars in baggage fees the largest amount in a six machine period. experts say the industry is still in transition following day decade that lead to bankruptcies and mergers. number of airlines accounting for 85% of domestic flights has shrunk to five. >>> staying active typically good for older people it appears there's a downside more seniors are getting knee replacement. from 1991 to 2010, the number of knee replacement surgeries more than doubled among medicare patients, 65 and older, 244,000 seniors have had the procedure in 2010. part of the reason is people are living longer and staying more active, also the issue of joint damaging obesity. >>> encouraging scientific discovery could mean using a virus to cure acne, researchers identified a class of virus that attacks and kills acne bacteria they say the virus lives on our skin, harmless, when it is exposed to acne bacteria it goes on attack. researchers say viruses or enzymes they